GRANT, Lyle K.; SPENCER, Robert E. The Personalized System of Instruction: Review and Applications to Distance Education. The International Review of Research in Open and Distributed Learning, [S. l.], v. 4, n. 2, 2003. DOI: 10.19173/irrodl.v4i2.152. Disponível em: https://www.irrodl.org/index.php/irrodl/article/view/152. Acesso em: 24 jun. 2024.